Joyeee 3D Wooden Brain Teaser Puzzle Key Lock &ndash; Diamond Cube Interlocking Jigsaw Puzzles for Teens and Adults - Challenge Your Logical Thinking - Ideal Gift and Decoration Idea Intelligence puzzle toy originated from ancient China which called Kong Ming Lock. Wooden game with interesting logical thinking and perfect for development of brain. Nice challenge to both adults and kids. Assemble the different wooden pieces into a diamond shape. Precision assemble non-identical pieces into a 3D shape. Challenging 3D puzzle game. Can you put the small pieces of wood together to create the three-dimensional shape? One-of-a-kind: Every Joyeee Brain Teasers is completely unique, handcrafted from premium grade, fully organic wood by the finest master craftsmen using only time-honored traditional methods and techniques. Compact Size: product dimension: 3.1 x 3.1 x 3.1 inch (8 x 8 x 8 cm). Weight: 0.1 pound (0.05 kg). Handsome addition to a desk or table, worthy of displaying! This one is so attractive that it can easily be used as a decoration in a den, family room, living room, working table, office or waiting room. 100% litetime guarantee: All authentic Joyeee products come with a lifetime warrantee. If it breaks - ever - we will replace it for you completely free of charge.